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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 huangx607087 5780
#2 nikost 4795
#3 QwertyPi 4480
#4 saro 4040
#5 Zukane 3660
Recent Solves
A True Genus tec
Modular Arithmetic 2 Moulik_Jindal
Network Attacks p1ain0
Modular Arithmetic 1 Moulik_Jindal
XOR Starter newo
Recent Solutions
Better than Linear klmn 0
Chinese Remainder Theorem Emms 0
Confusion through Substitution esraashrouf 0
Round Keys esraashrouf 0
Structure of AES esraashrouf 0

Level Up

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